Executing a timer event only once

Is it possible to create a timer event that, once it activates, executes only once? I'm trying to make it so that, once a specific event occurs, another action happens 1 second after the event. I tried using $tu(seq, 1/60, 0, 1)$ in an if statement that checks whether the event has happened, and the goal is to set the output to 1 once it happens, however it just alternates between 0 and 1 every second.